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Calculating Instruments > Navigational equipment

+ 2010/1/6 Astro-compass, Mk.II, metal / g...
+ 2010/1/130 Circular navigational slide c...
+ 2010/1/134 Circular navigational slide r...
+ 2010/1/155 Navigational circular slide c...
+ 2010/1/169 Navigational protractor with ...
+ 2010/1/171 Circular navigational slide r...
+ 2010/1/177 Navigational slide rule in sl...
+ 2005/160/1 Wearable GPS tracking device ...
+ 2008/227/1 Wearable GPS tracking devices...


Calculating Instruments > Military equipment

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+ 2010/1/29 Gun position training, metal /...
+ 2010/1/86 Sound ranging comparator, Mark...
+ 2010/1/87 Sound-ranging comparator Mark ...
+ 2010/1/122 Field plotter Mk IV with case...
+ 2010/1/133 Circular slide rule with flig...
+ 2010/1/135 Military circular slide rules...
+ 2010/1/201 Artillery plotter, No.1, meta...
+ 2010/1/215 Dual side military slide rule...
+ 2010/1/250 Circular military slide rule ...
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+ 2010/1/290 Bombardment spotting disc and...
+ 2010/1/293 Rangefinder, Optical Coincide...
+ 2010/1/294 Rangefinder converters (2), m...
+ 2010/1/295 Range finder converter, wood ...
+ 2010/1/296 Battenberg course indicator w...
+ 2010/1/308 Plotting instrument for anti ...
+ 2010/1/571 Military slide rule with pouc...


Astrograph, Type A-1, 1935 - 1945

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Object statement
Astrograph with box, Type A-1, metal / glass, made by the Sperti Company, Cincinatti, United States of America, used by the US Army, c. 1940
This object is part of a collection relating to the history and development of calculating devices assembled by Assoc Professor Allan Bromley of Sydney University, comprising mathematical instruments, slide-rules, mechanical and electronic calculators, electronic analogue computers, computer components, kit computers, education computers, and associated ephemera.

Allan Bromley was a lecturer and researcher at the University of Sydney Basser Department of Computer Science from 1978 until his untimely death in August 2002. He specialised in Computer Architecture, Computer Logic and in particular the History of Computing. He was regarded as the world authority on Charles Babbage's Calculating Engines (instigating the building of the Difference Engine No.2 at the Science Museum London) and the Antikythera Mechanism and had extensive knowledge of calculators, analogue computers, logic, stereopsis, totalisators, clocks and time keeping and mechanical engineering.
This is a Type A-1 Astrograph, Specification 27404, as used by the US Army Air Force. The Astrograph was used in aircraft night-time navigation in which the stars provided reference points. A map of the constellations printed onto a translucent sheet of film was rolled through the device under the glass plate and lit from behind. It was used in conjunction with an astrocompass (see P.159/6). The astrocompass would provide the heading of the aircraft with respect to the declination of a particular star and the astrograph would be used to identify which star you were using. It was probably used during WWII for night flying over the Pacific.
Used by the US Army.

 This text content licensed under CC BY-NC.

Description
Astrograph with box, Type A-1, metal / glass, made by the Sperti Company, Cincinatti, United States of America, used by the US Army, c. 1940

It has lighting components behind a window. On the front there is a polar scale with Longitude and Latitude, which may be scrolled. The instrument is packed in a cast metal box with screwed-on shelf with the main components. In the bottom there are compartments for parts. The Astrograph was made by the Sperti Company in Cincinatti, USA.
Made: 1935 - 1945
2010/1/289
Production date
1935 - 1945
Height
260 mm
Width
370 mm
Depth
280 mm

 This text content licensed under CC BY-SA.
Acquisition credit line
Donated through the Australian Government Cultural Gifts Program in memory of Associate Professor Allan Bromley, 2010
Subjects
+ Service life
+ Air navigation
Short persistent URL
Concise link back to this object: http://from.ph/374937
Cite this object in Wikipedia
Copy and paste this wiki-markup:

{{cite web |url=http://from.ph/374937 |title=Astrograph, Type A-1 |author=Powerhouse Museum |accessdate=28 August 2014 |publisher=Powerhouse Museum, Australia}}


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Object viewed 2669 times. Parent IRN: 1818. Master IRN: 1818 Img: Flv: H:px W:px SMO: RIGHTS:.